Of the 4Cs, cut is the most important characteristic because it has the greatest influence on a diamond's sparkle. Simply put, the better the cut grade, the more it will sparkle.

Even if a diamond has a perfect clarity and color grade, if it has a poor cut, it may appear dull.

Gemologists recommend choosing the highest cut grade within your budget. Very Good or better, if possible.

A diamond's cut grade is an objective measure of a diamond's light performance, or, what we generally think of as sparkle. When a diamond is cut with the proper proportions, light is returned out of the top of the diamond (which gemologists refer to as the table). If it is cut too shallow, light leaks out of the bottom; too deep and it escapes out of the side.

Top 25%

Top 35%

Poor/Fair Cut

Represents roughly the top 35% of diamond cut quality. These diamonds tend to appear dull or glassy.

Low grade not offered by Blue Nile.

Expert Buying Tips

For the best possible cut, look to the Blue Nile Signature Collection. Custom made exclusively for Blue Nile, each Signature Collection diamond is hand-selected and cut to the most exacting standards, guaranteeing one of the finest cuts available in the world.

Diamonds with a cut grade of good or very good represent an excellent combination of beauty and value.